Here is the original straight out of camera without any corrections:
Nadine_Vb is right on how this image was achieved: Camera shutter open in bulb mode for 28s, half of the sensor exposed for a couple seconds. Camera rotated 180º and the opposite part of the sensor expose for another couple seconds.
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I know how I would (try to) pull this of in-camera (2*1/2 - 180°) But I would be surprised if you did it this way as well. I'm curious about the notes :)